DNS - Domiain Naming Service Please find below details for how DNS work, -When you type a URL on the browser, below are the course of actions performed. 1) -Browser cache is checked. 2) -Local hosts file is looked up for any records placed inside etc folder. 3) -URL query works right to left i.e for www.golinuxhub.com, .com is queried first and then the query moves from right to left. 4) -The request then goes to ISP, if any earlier request for the same website was made then they will bring up the page from the stored cache. 5) -Next the query goes to root servers which will provide you the address of the Top Level Domain. 6)-The TLD will provide the location of nameserver, so next the ISP contacts nameserver for proper record. 7) -Once the ISP gets the record information it locally stores the information for further queries and throws the output on your browser. -Next time the query is made for the same page the ISP won't go through all these steps and bring out the page as per the cache stored from last query till the TTL value for that record is expired.